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From:   Martin Zaharinov <micron10@gmail.com>
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Subject: Urgent: BUG: PPP ioctl Transport endpoint is not connected
Message-Id: <83C781EB-5D66-426E-A216-E1B846A3EC8A@gmail.com>
Date:   Wed, 9 Dec 2020 16:47:52 +0200
Cc:     Eric Dumazet <eric.dumazet@gmail.com>, netdev@vger.kernel.org
To:     "linux-kernel@vger kernel. org" <linux-kernel@vger.kernel.org>
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Hi All

I have problem with latest kernel release=20
And the problem is base on this late problem :


=
https://www.mail-archive.com/search?l=3Dnetdev@vger.kernel.org&q=3Dsubject=
:%22Re%5C%3A+ppp%5C%2Fpppoe%2C+still+panic+4.15.3+in+ppp_push%22&o=3Dnewes=
t&f=3D1

I have same problem in kernel 5.6 > now I use kernel 5.9.13 and have =
same problem.


In kernel 5.9.13 now don=E2=80=99t have any crashes in dimes but in one =
moment accel service stop with defunct and in log have many of this line =
:


error: vlan608: ioctl(PPPIOCCONNECT): Transport endpoint is not =
connected
error: vlan617: ioctl(PPPIOCCONNECT): Transport endpoint is not =
connected
error: vlan679: ioctl(PPPIOCCONNECT): Transport endpoint is not =
connected

In one moment connected user bump double or triple and after that =
service defunct and need wait to drop all session to start .

I talk with accel-ppp team and they said this is kernel related problem =
and to back to kernel 4.14 there is not this problem.

Problem is come after kernel 4.15 > and not have solution to this =
moment.

Please help to find the problem.

Last time in link I see is make changes in ppp_generic.c=20

ppp_lock(ppp);
        spin_lock_bh(&pch->downl);
        if (!pch->chan) {
                /* Don't connect unregistered channels */
                spin_unlock_bh(&pch->downl);
                ppp_unlock(ppp);
                ret =3D -ENOTCONN;
                goto outl;
        }
        spin_unlock_bh(&pch->downl);


But this fix only to don=E2=80=99t display error and freeze system=20
The problem is stay and is to big.


Please help to fix.